a_uip_patch

diff --git a/UIPEthernet.cpp b/UIPEthernet.cpp
index 0a762ed..3025718 100644
--- a/UIPEthernet.cpp
+++ b/UIPEthernet.cpp
@@ -154,13 +154,13 @@ UIPEthernetClass::tick()
           uip_len = network_read_next(UIP_BUFSIZE, (uint8_t *)uip_buf);
           if (ETH_HDR ->type == HTONS(UIP_ETHTYPE_IP))
             {
+              network_read_end();
               uip_arp_ipin();
               uip_input();
               if (packetstream > 0)
                 {
                   return;
                 }
-              network_read_end();
               if (uip_len > 0)
                 {
                   uip_arp_out();
@@ -176,6 +176,7 @@ UIPEthernetClass::tick()
                   network_send();
                 }
             }
+          else network_read_end();
         }
       if (timer_expired(&periodic_timer))
         {